A solid cube of mass 5 kg is placed on a rough horizontal surface, in xy- 
plane as shown. The friction coefficient between the surface and the 
cube is 0.4. An external force F = 6 i ^ + 8 j ^ + 20 k ^  ​ N is applied on the cube. 
(use g = 10 m/ s 2
(A) The block starts slipping over the surface 
(B) The friction force on the cube by the surface is 10 N. 
(C) The friction force acts in xy-plane at angle 12 7 °  with the positive 
x-axis in clockwise direction. 
(D) The contact force exerted by the surface on the cube is 10 10 N. ​

 

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